Aging-resistant and corrosion-resistant SMC sheet molding compound and molding device thereof

Abstract

The invention discloses an aging-resistant and corrosion-resistant SMC sheet molding compound and a molding device thereof. The aging-resistant and corrosion-resistant SMC sheet molding compound comprises following raw materials in parts by weight: 70-120 parts of epoxy vinyl ester resin, 2-4 parts of an antioxidant, 8-12 parts of a flexibilizer, 15-30 parts of a low profile agent, 1-5 parts of athickener, 30-50 parts of 15-25mm alkali-free untwisted glass fibers, 8-12 parts of a release agent, 1-4 parts of a curing agent, 5-10 parts of color paste, 2-2.5 parts of a dispersing agent, and 0.5-1.5 parts of active magnesium oxide. The forming device thereof comprises an upper die and a lower die, a first trapezoidal push block and a second trapezoidal push block are respectively arranged inthe upper die and the lower die, an L-shaped transmission rod is rotatably connected to a die arm, and a cross beam is arranged above an upper push plate. According to the aging-resistant and corrosion-resistant SMC sheet molding compound and the molding device thereof, by adopting the vinyl ester resin, the antioxidant and the flexibilizer, the corrosion resistance and the aging resistance are improved, a cooling device is additionally arranged so that the processing efficiency is improved, and the technology of simultaneous demolding of the upper side and the lower side is adopted so that the defect that a processed product is difficult to take out during single-side demolding is overcome, the push blocks are combined with the ejector rod, and the defect that the processed product is easily damaged by ejection during demolding by the push rod is overcome.

Description

technical field [0001] The invention relates to the technical field of SMC sheet molding compound preparation, in particular to an aging-resistant and corrosion-resistant SMC sheet molding compound and a molding device thereof. Background technique [0002] SMC is sheet molding compound. The main raw material of SMC is composed of SMC special yarn, unsaturated resin, low shrinkage additive, filler and various auxiliary agents. SMC has the advantages of superior electrical properties, light weight, easy and flexible engineering design, and its mechanical properties are comparable to some metal materials, so it is widely used in transportation vehicles, construction, electronics, electrical and other industries. [0003] At present, SMC sheet molding compound is mostly made of unsaturated resin, which is easy to age when exposed to the natural environment for a long time, and has poor toughness, impact resistance, and poor corrosion resistance. At the same time, the ejection...

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Problems solved by technology

[0003] At present, SMC sheet molding compound is mostly made of unsaturated resin, which is easy to age when exposed to the natural environment for a long time, and has poor toughness, impact resistance, and poor corrosion resistance.

At the same time, the ejection mechanism of the SMC molding device in the prior art is ejected from one side of the mold, for example: application number CN200620160369.X rapid prototyping mold for sheet molding compound, shown from the side of the upper mold, or Demoulding from one side of the lower mold, it is very easy to eject from one side when the product is solidified and opened. Due to the effect of vacuum, the mold is adsorbed on the mold without an ejection mechanism on the other side, which makes it inconvenient to take out the product. Production efficiency is reduced, and the ejector mechanism in the prior art is composed of a large number of ejector pins arranged on one side of the mold. For example, as shown in Patent Document 1, the shortcoming of this design is: due to the lack of cooling devices in the mold Since the newly cured product has not yet reached sufficient hardness, many small ejector pins are easy to leave top marks on the mold, which affects the processing quality of the product, and the excessive number of ejector pins is difficult to process during manufacturing. The heated and melted SMC can easily enter the inside of the ejector pin, causing the mold to jam in the light case, and even cause the ejector pin to break and damage the mold in the severe case.

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